It seems written at a time where most Western philosophers did that. I do think that the wager is not a viable argument to pick christianity over other religions. But it's still viable for picking christianity (or any religion) over non-religion. That's why the Argument from Inconsistent Revelations changes the math to where it weakens the probability of success but makes the wager generalizable.
Of course an elephant in the room is that not all religions require belief. In Buddhism, the soul is reincarnated whether it is Buddhist or not, for example. There's a different type of reward system altogether for those faiths than just a heaven for believers and for non-believers.